CVE-2021-4105

CRITICALNVD 9.89.8—

9.8

Improper Handling of Parameters vulnerability in BG-TEK COSLAT Firewall allows Remote Code Inclusion.

This issue affects COSLAT Firewall: from 5.24.0.R.20180630 before 5.24.0.R.20210727.

CVSS v3: 9.8
EG Score: 9.8(medium)
EPSS: 72.9%
KEV: Not listed

Published

February 24, 2023

Last Modified

May 18, 2026

Advisory Details (3)

Auto-updated May 18, 2026

No patch confirmed yet.

generic

T.C. Siber Güvenlik Başkanlığı

https://www.usom.gov.tr/bildirim/tr-23-0108

generic

ÖNEMLİ: Kritik Güncelleme - 27-07-2021 tarihinde yayınlanan güncelleme içeriği | Coslat Firewall Blog

http://blog.coslat.com/2021/07/onemli-kritik-guncelleme-2021-07-27.html

generic

T.C. Siber Güvenlik Başkanlığı

https://siberguvenlik.gov.tr/guvenlik-bildirimleri/detay/tr-23-0108

Vendor Advisories for CVE-2021-4105(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

GHSA-gr7g-5rvj-cf96
GitHub Security AdvisoriesCritical
Improper Handling of Parameters vulnerability in BG-TEK COSLAT Firewall allows Remote Code...

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-755Improper Handling of Exceptional Conditions

Data Freshness Timeline

(refreshed 10× in last 7d / 20× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-06-02 20:11 UTCepss_batch
2026-06-02 20:11 UTCepss_batch
2026-06-01 13:50 UTCepss_batch
2026-06-01 13:50 UTCepss_batch
2026-05-31 22:29 UTCepss_batch
2026-05-31 00:15 UTCepss_batch
2026-05-31 00:15 UTCepss_batch
2026-05-29 13:42 UTCepss_batch
2026-05-28 13:43 UTCepss_batch
2026-05-28 13:43 UTCepss_batch
2026-05-27 13:39 UTCepss_batch
2026-05-27 13:39 UTCepss_batch
2026-05-26 13:43 UTCepss_batch
2026-05-26 13:42 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-22 21:16 UTCepss_batch
2026-05-22 21:16 UTCepss_batch
2026-05-22 21:16 UTCepss_batch
2026-05-22 21:16 UTCepss_batch

Frequently asked(5)

What is CVE-2021-4105?

CVE-2021-4105 is a critical vulnerability published on February 24, 2023. Improper Handling of Parameters vulnerability in BG-TEK COSLAT Firewall allows Remote Code Inclusion. This issue affects COSLAT Firewall: from 5.24.0.R.20180630 before 5.24.0.R.20210727.

When was CVE-2021-4105 disclosed?

CVE-2021-4105 was first published in the National Vulnerability Database on February 24, 2023, with the most recent update on May 18, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2021-4105 actively exploited?

CVE-2021-4105 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 72.9% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2021-4105?

CVE-2021-4105 has a CVSS v3 base score of 9.8 (NVD).

How do I remediate CVE-2021-4105?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-4105, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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Is Your Infrastructure Affected by CVE-2021-4105?

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CVE-2021-4105

📅 Published

🔄 Last Modified

📋 Advisory Details (3)

T.C. Siber Güvenlik Başkanlığı

ÖNEMLİ: Kritik Güncelleme - 27-07-2021 tarihinde yayınlanan güncelleme içeriği | Coslat Firewall Blog

T.C. Siber Güvenlik Başkanlığı

📣 Vendor Advisories for CVE-2021-4105(1)

Weakness Classification(1)

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2021-4105?

🔗 Related CVEs(same CWE)

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Published

Last Modified

Advisory Details (3)

Vendor Advisories for CVE-2021-4105(1)

Frequently asked(5)

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